Databases
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Postsdbo
PO
 

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    <p>If I understand you problem correctly, you are trying to save an object graph containing a ParentObject and related ChildObjects and you're getting the exception because Attach() is not able to reconcile Id collisions among the ChildObjects in the database and the attached ParentObject.</p> <p>Below is a work around I've used in the past. It's not pretty but it gets the job done.</p> <pre><code>public ParentObject Upsert(ParentObject newParentObject) { // Check for an existing ParentObject. ParentObject exisitingParentObject = container.ParentObjects.SingleOrDefault(o =&gt; o.Id == newParentObject.Id); // If not an existing ParentObject if (exisitingParentObject == null) { // Add a new ParentObject exisitingParentObject = container.ParentObjects.Add(container.ParentObjects.Create()); } // Update the properties of the existing ParentObject with the values of the new ParentObject var parentEntry = container.Entry(exisitingParentObject); parentEntry.CurrentValues.SetValues(newParentObject); // Remove ChildObjects that are in the existing but not in the new. for (int i = exisitingParentObject.ChildObjects.Count() - 1; i &gt;= 0; i--) { ChildObject exisitingChildObject = exisitingParentObject.ChildObjects[i]; if (!newParentObject.ChildObjects.Any(o =&gt; o.Id == exisitingChildObject.Id)) { container.ChildObjects.Remove(exisitingChildObject); } } // Upsert new ChildObjects foreach (ChildObject newChildObject in newParentObject.ChildObjects) { // Check for an existing ChildObject ChildObject exisitingChildObject = exisitingParentObject.SingleOrDefault(o =&gt; o.Id == newChildObject.Id); // If not an existing ChildObject if (exisitingChildObject == null) { // Add a new ChildObject exisitingChildObject = exisitingParentObject.ChildObjects.Add(container.ChildObject.Create()); } var childEntry = container.Entry(exisitingChildObject); childEntry.CurrentValues.SetValues(newChildObject); } container.SaveChanges(); return exisitingParentObject; } </code></pre>
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    1. POUpdate and Add Child Rows at same time with Entity Framework
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    1. USRay Saltrelli
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    1. COI agree that i might work, but its a bit messy, isn't it?
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    2. COIt is. I'm not thrilled about having to do this but I know it works. If anyone else has a cleaner way to do it I'd love to hear about it too.
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      1. USRay Saltrelli
    3. COmy code works once you don't pass a stub as a parameter...
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      1. USGabriel
 

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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

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